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Finding the Fourth Proportional to 716.64, 1,075.20 and 442.35

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Solution

The fourth proportional to 716.64, 1,075.20 and 442.35 is: 663.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.64 : 1,075.20 = 442.35 : x
  2. Step 2: Convert to fraction form
    716.64/1,075.20 = 442.35/x
  3. Step 3: Cross multiply
    716.64x = 1,075.20 × 442.35
  4. Step 4: Simplify right side
    716.64x = 475,614.72
  5. Step 5: Solve for x
    x = 475,614.72/716.64
  6. Step 6: Final answer
    x = 663.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.